Immunohistological aspects of nephropathy with minimal lesions

1977 
: Renal biopsies from 32 patients, whose light microscopy showed a pattern of minimal changes nephropathy, have been submitted to immunohistological examination. On the basis of immunofluorescence pattern we separated the cases into three groups: the first group (12 cases) was characterized by absence of any glomerular deposit. The second group (9 cases) showed focal and segmental deposits of IgM and sometimes C3 on capillary walls. In the third group (11 cases) we observed slight deposits of IgM and sometimes C3 "comma like" over glomerular structures in all glomeruli. The site of these last deposits was sometimes mesangium and sometimes the capillary walls. The results of immunohistological examinations gave no information about the pathogenetic mechanisms of minimal changes nephropathy. We observed that the patients enclosed in the second group had a worse clinical prognosis, compared with the other two groups.
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